An apparatus and method for 
processing a 
crop residue, which includes but is not limited to, destroying 
weed seeds present in the 
crop residue. The apparatus (10) comprises an elongate housing (12) having an inlet (20) for receiving 
crop residue N and an outlet (22) for discharging the 
crop residue. The apparatus (10) also has one or more rotors (24), (26) located in the elongate housing (12). Each rotor (24), (26) comprises a plurality of radially extending 
impact members (28a), (28b), (28c), (28d), (28e), (28f) which rotate with the one or more rotors (24), (26) and 
impact against the 
crop residue, so that lighter material of the 
crop residue is subjected to less impacts and denser material of the crop residue is subjected to relatively more impacts.